Research Article
Study on Fracture and Stress Evolution Characteristics of Ultra-Thick Hard Sandstone Roof in the Fully Mechanized Mining Face with Large Mining Height: A Case Study of Xiaojihan Coal Mine in Western China
Figure 4
Lateral support pressure distribution of coal seam under different roof caving forms: (a) roof completely caving; (b) roof layered caving.
(a) |
(b) |